Ratchet drill-stock



(No Model.)

C. H. WILMOTH.

RATGHBT DRILL STOCK.

-llfo.3'78,689. Patented Peb. 28, 1888.

f @Whom/1913 N. PETERS. Phnmmhogmpher. wasnmmn. n. a

llniirnn drains Farmsum @tripa CORYDON H. VILMOTH, OF TERRE HAUTE, INDIANA.

RATCHET DRELL=STOCK SPECIFICATION forming part of Letters Patent No. 378,639, dated February 28, 1888.`

(No model.)

To all whom it may concern:

Be it known that I, Common H. WrLMorn, a citizen of the United States, residing at Terre Haute, inthe county of Vigo and State of lndiana, have invented a new and useful lmprovement in Ratchet Drill-Stocks, of which the following is a specification.

My invention relates to an improvement in a ratchet drill-stock for which Letters Patent No. 365,214L were issued to me June 2l, 1887.

The object of my present improvement is to facilitate the manufacture of the drillstock and to provide a novel, stronger, and more practical arrangement of its working parts.

The accompanying drawings illustrate my improvement.

Figure l is a side elevation having a small portion broken away. Fig. 2 is a plan at a,

Fig. l. Fig. 3 is a vertical section. Fig. 4 is a transverse section at b, Fig. l. Fig. 5 is a transverse section at c, Fig. l. Fig. 6 is a transverse section of the tool-holding shaft at d. Fig. 7 is a plan of the under side of the ratchetcollar.

Myinvention. as described in the above'mentioned Letters Patent consists, essentially, of a short shaft having a socket in one end to receive a drillshank, a ratchet-wheel secured to said shaft, a handle having bearings in which the shaft revolves, an operating-lever mounted 011 the shaft so as to turn thereon, and carrying a pawl which engages the ratchet-wheel and turns the shaft when the operating-lever is turned in one direction, a second ratchetwheel, also secured to the shaft, a collar mounted on the shaft so as to turn about said second ratchet-wheel, and carrying a pawl which engages the ratchetwvheel, and provided also with cog-teeth on the periphery of the collar, which engage similar teeth formed on a lever which is pivoted to the handle and is connected to the operating-lever, the arrangement being`V these pieces forming the collar together after they have been mounted on the shaft, which is inconvenient and expensive. In my present improvement this difficulty is avoided as v follows:

Ais the drillshaft, having a socket, s, adapted to hold the drill-shank.

B is the handle. The handle is perforated at one end to forni a bearing, f, for the shaft. On the shaft is formed a collar, C, having on its upper side an annular recess, g, Fig. 6. In this recess are formed depressions at h h, in which are pivoted pawls t i, which are each supported at their free ends by a spring, j, Fig. l.

Mounted on the drill-shaft, immediately above the collar C, is a cog-wheel, D, having formed on its under side an annular projection fitted to turn easily in the recess g, and having a series of ratchet-teeth, k, which engage the pawls t', as clearly shown in Fig. l. Wheel D is held-in place on the shaft and in engagement with the pawls t' bya collar, E, which is screwed onto the shaft against a shoulder at Z, Fig. 3, so that the cog-wheel D is held so as to turn easily between the collars G and E.

F is a plate resting at one end on a stud, m, projecting from the handle B, the plate being secured by a bolt, n, and forming at its other end a bearing for the shaft A.

H is a ratchet-wheel secured to shaft A by a key, o.

I is the operating-lever, forked at one end to embrace the ratchet-wheel and perforated so as to turn on the shaft. Lever I carries a pawl, p, which engages the ratchetrwheel H.

J is a lever pivotcd to the handle B on the stud m, and having teeth 1', which intermesh with the cogs of wheel l). The other end of lever J is slotted att and is attached to the operating-lever, so as to move therewith, by a stud, a.

The upper end of shaft A is bored out and screw-threaded to receive the feed-screw L, which has a keyway, o, extending nearly its entire length, and is turned by means of a notched wheel, w, having a pin, Z, which projects into the keyway of the screw, and which is turned at the will of the operator by means of a rod, fr, having its end notched to engage the wheel w, and which is held normally out IOO of engagement with the wheel by a spring, y, andis forced into engagement by the bell-crank lever z. v

In operation lever I, being moved toward the left, engages ratchet-Wheel H and turns the drill-shaft in the same direction, at the same time operating lever J and turning Wheel D in the opposite direction, the ratchetteeth ofsaid Wheel slipping idly over the pawls 13. Lever I being noW moved in the opposite direction, the ratchet-teeth 7c of wheel D engage the pawls z' on C and turn the drill-shaft in the same direction as when the operating-lever moved toward the left. The drill-shaft is thus rotated in one direction by both movements of the operating-lever.

I claim as my invention- 1. In a ratchet drill-stock, the combination, with the drill-shaft, the ratchetwheel secured thereto, the operating-levermounted on the shaft and carrying a pawl which engages said ratchet-Wheel, the handle, also mounted on the stesse shaft, and the toothed le've'r pivoted to the handle and attached to the operatinglever, of the recessed collar C, having one or more pawls, i, pivoted in th`e upper face thereof, and the cog-Wheel arranged to turn on the shaft and to intermesh with said toothed lever, and having on one side a ratchet-toothed annular projection arranged to engage the pawls on the collar, in the manner and for the purpose specified.

2. In a ratchet drill-stock of the above-described class, the combination of the drill-shaft having the recessed collar C, the pawls pivoted in said recess, the cog-wheel D, having the ratchet-teeth lo, the collar E, the handle B,

' and the lever J, all arranged to co-operate substantially as and for the purpose speciiied.

CORYDON H. VILMOTH.

Witnesses:

M. CARs'rEN, A. M. Hoon. 

